Lathe.



B. H. CLEMENT.

LATHL APPLICATION FILED MAR. 3|. I9I4.

l l 34,37%, Patented Apr. 6, 1915*.

3 SHEETS-SHEET 1.

INVENTO- ATTORNEY B. H. CLEMENT.

LATHE.

APPLICATION min MAR. 3\. 1914.

l, l 34,374. Patented Apr. 6, 1915.

3 SHEETS-SHEET 2.

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ATTO RN EY ""3 Hamers #aL- H5 Co., PwnTorLlHo., WASHINGTON, D. C

B. H. CLEMENT.-

LATHE.

APPLlcATloN FILED MArLal, 1914.

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BURTON H. CLEMENT, OF BELOIT, WISCONSIN, ASSIGNOR OF ONE-HALF TO HENRY L. TROWBRIDGE, 0F BELOIT, WISCONSIN.

LATI-1E.

Speccaton of Letters Patent.

Patented am. c, raie.

Application led March 31, 1914. Serial No. 828,545.

T0 all Lv/0m it may concern:

Be it known that I, BURTON H. CLEMENT, a citizen of the United States, residing at Beloit, in the county of Rock and State of ldisconsin, have invented a new and useful Lathe, of which the following is a specification.

This invention has reference to improvements in lathes, and its object is to provide a small, compact, screw-cutting and woodturning lathe capable of doing accurate work, and yet one of extreme simplicity and relatively cheap construction having certain advantages which will hereinafter appear.

In accordance with the present invention the working parts of the lathe are mounted on a rockable bed so that chips or shavings find no lodgment on any part of the bed, but at once fall out of the way, wherefore the lathe is particularly clean in operation. Moreover, the rockable bed forms an efficient belt tightener and is particularly valuable in connection with a foot power drive.

The improved lathe provides back gearing, which in conjunction with readily interchangeable feed screws constitutes the lathe a screw-cutting lathe of eiiiciency.v

The invention will be best understood from a consideration of the following detailed description, taken in connection with the accompanying drawings forming a part of this specification, with the further understanding that while the drawings show a practical form of the invention, the latter is not confined to any strict conformity with the showing of the drawings, but may be changed and modied so long as such changes and modifications mark no material departure from the salient features of the invention as set forth in the claims.

In the drawings: Figure 1 is an end elevation of a lathe embodying the present invention. Fig. 2 is a plan view of the lathe with distant parts omitted. Fig. 3 is a front elevation of the lathe with parts below the bed in the main omitted. Fig. 4 is a section on the line 4 of Fig. 1. Fig. 4a is an elevation of a modification of a detail of the construction. Fig. 5 is a section on the line 5 5 of Fig. 4. Fig. 6 is a section on the line 6 6 of Fig. 2 with distant parts omitted. Fig. 7 is a section on the line 7 7 of Fig. 4,

some distant parts being omitted. Fig. 8 is a section on the line 8 8 of Fig. 4 with distant parts omitted. Fig. 9 is a section on the line 9 9 of Fig. 3 with distant parts omitted. Fig. 10 is a fragmentary section on the line 10 10 of Fig. 3. Fig. 11 is a section on the line 11-11 of Fig. 10. Fig. 12 is a detail elevation of a ring mounted on the tool carriage.

Referring to the drawings, there is shown a bed 1 of general tubular form with terminal reduced extensions 2 adapted to cap plates 3, which latter have expanding leg portions 4 channeled for the reception of legs 5 upon which the end plates and bed 1 with parts carried thereby, and which are to be described, are sustained.

At suitable points about midway of the length of the legs 5 at each end of the lathe, these legs are connected by a cross piece 6 suitably fastened to the legs to aid in keeping them from spreading, and each cross piece 6 at one end is formed with a bearing for a shaft 7 upon opposite ends of which are mounted wheels 8 and 9, respectively, the wheel 8 being suitably grooved for the reception of a belt 10, and the wheel 9 being located at the other end of the machine serving conveniently as a fly-wheel. Extending between what may be termed the front legs of the two pairs of legs of the machine and near the lower ends of these front legs, is a rod 11 upon which are mounted treadles 12 connected by links 13 to respective wheels 8 and 9, so that the shaft 7 with the wheels 8 and 9 may be conveniently rotated by the operator.

Extending through the cap plates 3 and axially through the tubular bed 1 is a rod or bolt 14 having a head 15 at one end and a nut 16 at the other end, the bolt serving to hold the cap plates and bed together, but permitting the turning of the bed about its longitudinal axis, this being done by loosening the nut 16, and the bed is held in any desired position of adjustment about its longitudinal axis by tightening the nut 16.

At one end the bed 1 is provided with a head stock 17 and at the other end with a tail stock 18, and these parts may be cast in one piece with the bed, or if desired may be separately cast and secured to the bed in any suitable manner, so as to be in effect in one piece therewith. rdinarily the tail stock of the lathe is made adjustable toward and from the head stock, but in the lathe of the present invention this is not done, for the tail stock is effectively in one piece with the bed, and located permanently with relation thereto, while provision is made for adjustments usually brought about in lathes by movements of the tail stock.

The head stock and tail stock adjacent to the bed have alined bores or passages 19, 20, respectively, and at respectively opposite ends of the bores the head stock is provided with an annular flange 21 in alinement with the bore 19, and the tail stock is provided with an annular flange 22 in alinement with the bore 20.

The head stock has at the end remote from the bed 1 an angular extension 23 from which there projects a yoke 24 having an angular leg 25 spaced from the head stock on the side thereof remote from the tail stock and returned toward the prolongation of the longitudinal axis of the alined passages 19 and 20, where the leg 25 terminates in a bearing 26.

Extending through thepassages 19 and 20 and long enough to project beyond the flanges 21 and 22'is a hollow shaft 27 provided where extending through the passage 20 with an elongated key way 28. The shaft 27 carries a rotatablesleeve 29 counterbored at one end, as Vshown at 3 0, to receive the flange 21, and on its exterior surface provided at the said end with a circular series of gear teeth 32, these teeth constituting a gear pinion. The sleeve 29 extends through and is supported by the bearing 2,6 at the corresponding end of the leg 25, and beyond this bearing has an extension 33 of reduced diameter and terminates in an inturned annular flange 34 providing a passage of substantially the same bore as the interior of the tubular shaft 26, and in alinement therewith. The shaft 27 is designed to receive a rod 35 having one end extending through the annular flange 34 where it is held by a set screw 36 which may be in the form of a thumb screw, or may beany typerof screw suitable for holding the rod 35 firmly to the sleeve 29, but permitting theV ready withdrawal of the rod from the sleeve 29 and shaft 27 when desired. .The rod 35 is of sufficient length to extend about to thevtail stock and for an appropriate portion of its length between the head and tail stocks is screw-threaded, as shown at 37. For reasons which will hereinafter appear the lathe may be furnished with a suitable lnumber of such screw rods, each of an appropriately different pitch from that of the others.

Mounted on the reduced end 33 of the sleeve 29 is a gear wheel 38 from one face of which there projects a hub 39 snugly yet freely fitting the prolongation 33 and provided with a longitudinal slot 40 through which there is extended a set screw 41 threaded into the extension 33 so that the gear wheel 38 maybe adjusted lengthwise of the extension 33 for a "distance Aregulated by the length of the slot 40, while a thumb screw 41 forms a convenient means for holding the gear wheel in adjusted positions.

In operation the head and tail stocks extend upwardly and rearwardly with respect to the'position occupied by the operator, which is at the right hand side of the machine as illustrated in Fig. y1. At a higher point in the head stock than the passage 19 is another passage 42 parallel with the passage 19 and at the respectively opposite ends of this passage are annular flanges 43 and 44, respectively. In line with the passage 42 the tail stock has a passage 45 therethrough, this passage terminating in annular flanges 46, 47, respectively, while from the flange '47 there is'rearwardly inclinedextensi on 48 lof the tail stock through which is produced a threaded passage 49 parallel with the passages 20 and 45 and prolonged by terminal anges 50.

The passage 45 is provided with a rod 51 which projects toward the head stock and at the end toward the head stock is formed with a tapered socket 52 for a taper center 53. Near the inner end of the socket 52 the rod 51 is providedrwith a transverse slot 5,4 so that the center 52 may be readily dislodged by the insertion of a suitable tool through the slot 54.'

The threaded vpassage 49 has an exteriorly screw-threaded rod 55 yextending therethrough, this rod having at the end toward the head stock an axially tapered socket 56 for ataper center 5 7, and at the other end the threaded rod 55 carriesa crank disk 58 provided with a crank handle 5 9 for the ready turning of the screw rod. The rod 55'near the crank disk 58 has a smooth section 60 which is journaled in a bearing 61 at one end of a block 62, the other yend i 63 of which is split and shaped to embrace the corresponding end of therod 51 and is made to bind on the rod 5l by means of a screw 64 provided with a manipulating handle 65. The screw rod 55 serves as a means for moving the rod 51 through the passage 45 to thereby adjust the center 53 toward land from the head stock, the center 57 parheld to its flange by a set screw 67 extending through a circumferentially disposed slot 68 in the sleeve 66, and this sleeve beyond the flange 22 is of reduced internal diameter to fit the shaft 27 snugly yet freely, and within the sleeve 66 there is lodged a key or spline 69 entering the groove 28 of the shaft 27.

The sleeve 66 close to the tail stock is formed with a gear segment 70 in mesh with which there is a worm section 71 on a worm shaft 72 having a supporting bearing 73 in an extension 74 of the flange 47, the shaft 72 being provided with an annular groove 75 in which is lodged a pin 76 traversing the bearing 73, so that the shaft may be turned without progressive movement. That end of the shaft 7 2 remote from the bearing 73 is provided with a crank disk 77 carrying a crank handle 78, whereby the shaft may be rotated as desired to thereby actuate the gear segment 70 and thus rock the sleeve 66 in one direction or the other, the hollow or tubular shaft 27 participating in this rocking movement for a purpose to be described.

Extending through the passage 42 in the head stock and an alining passage 79 in the leg 25 is a tubular shaft 80, one end of which extends beyond the flange 44 and there carries a gear Wheel 81 constituting a face plate and provided with the usual radial slots 82 for the reception of the tail end of a lathe dog. That end of the shaft carrying the gear wheel or face plate 81 is shaped for the reception of a center 83 in alinement with the center 5 3. The other end of the shaft 80 extends beyond that face of the leg 25 remote from the head stock and there is formed with an annular series of gear teeth 811 forming a gear pinion in position to mesh with the gear wheel 38 when the latter is moved toward the leg 25 and the shaft 80 is disconnected from the gear wheel 38 when the latter is moved away from the leg 25 to the extent permitted by the slot 40. Between the head stock 17 and the leg 211 the shaft 80 carries a gear pinion 85 made fast to the shaft by a set screw 86 or otherwise, and the gear wheel or face plate 81 is made fast to the corresponding end of the shaft 80 by a set screw 87 or in any other suitable manner.

The angle prolongation 23 of the head stock has a passage 88 therethrough parallel with the other passages through the head stock and the leg 25 has a similarly located passage 89 therethrough in alinement with the passage 88. Extending through and mounted in these two passages is a shaft 90 formed where passing through the leg 25 with spaced annular grooves 91, 92, respectively. Mounted on the shaft 90 between the head stock and the leg 25 is a gear wheel 93 having a pulley9et formed on one side thereof. The gear wheel 93 is made fast to the shaft 90 in any suitable way soas to move therewith both longitudinally and rotatively. That end of the shaft 90 remote from the grooves 91 and 92 has a pinion 95 fast thereto in position to mesh with the gear wheel 81, but the shaft 90 is capable of longitudinal movement to carry the pinion 95 out of mesh with the gear wheel 81. That end of the shaft provided with the pinion 95 is axially adapted for a threaded center pin 96 on a supporting plate 97 having its center in line with the center 57.

The leg 25 has an angle extension 98 on which there is mounted by a pivot 99 a latch arm 100 lying close to the inner face of the leg 25 and movable into and out of the grooves 91 and 92 through a notchv 101 formed in a flange 102 on the inner face of the leg 25 and surrounding the passages 89. By this means the shaft 90 may be adjusted lengthwise and held in the adjusted positions. When the latch 100 is in the groove 92, the pinion 95 is in mesh with the gear wheel 81 and when the latch is in the groove 91 the pinion 95 is moved out of mesh with the gear wheel 81. When. the shaft 90 is so positioned that the pinion 95 is outJ of mesh with the gear wheel 81, the gear 93 is in mesh with the pinion 85 but is out of mesh therewith when the pinion 95 and gear 81 are in mesh.

Pivotally mounted on the flange 21 close to the corresponding face of the head 17 is an arm 103 extending rearwardly with respect to the head and at the free end of this arm there is pivoted a latch arm 101 terminating in a handle 105, this latch arm extending through the space between the head 17 and leg 25 toward the front of the lathe. rl"he flange 413 is provided wth a tooth 106 best shown in F ig. 6, and the arm 101 is provided with notches 107 any one of which is adapted to receive the tooth 106, thus holding the arm 103 in different adjusted positions. The arms 103 and 104 are connected by a spring 108 tending to hold the arm 101 with the tooth 106 entering one of the notches 107. rllhe arm 103 has extensions 109, 110 on opposite sides of its pivot support upon the flange 21. The extension 109 carries a stud 111 upon which is mounted a gear pinion 112 so positioned that on a suitable roclring of the arm 103 this pinion will mesh with the pinion and is at all times in mesh with the pinion 32. The extension 110 is provided with studs 113, 114C carrying respective pinions 115 and 116 at all times in mesh with each other, while the pinion 115 is at all times in mesh with the pinion 32. On rocking the arm 103 in the direction to move the pinion 112 out of mesh with the pinion 85, the pinion 116 may be brought into mesh with the pinion 85, but because of the presence of two pinions 115 and 116, the motion transmitted thereby to the pinion 32 will be the reverse of lthat transmitted by the pinion 112. These two engaging positions Vare represented by the end notches of the. series of notches 107 ,Y

Aand `6. The pulley 94 is connected tothe drive wheel 8 by the belt 10.

Mounted upon the hollow or tubular shaft 427 between the head and tail stocks is va block 117 constituting the body of the Atool carriage vof the lathe, and this block is for-med with the usual undercut slot 118 for the headed stem 119 of .the customary tool .posty 120, which latter needs no description, as itmay follow the usual practice. VThe tool carriage 117 is held firmly to thehollow shaft 27 by a set screw 121. At one end the .block 117 has an axial prolongation 122 adjacent to which` the tool carriage or block is formed withV a boss 123 having a passage 124 .therethrough radial to the=shaft 27, and the latter is pierced by a radial passage 125 in line with .the passage 124 to receive the threaded end 126 of a feed nutin the form of an elongated block 127 adapted to the passages 124 and 125, while the threaded .endof this nut is adapted to lthe'threads of the threaded `end 37 of the rod 35.`

V'Iheprolongation 122 of the tool carriage `is yformed with aseat for yairing 128 -surrounding the shaft 27,V andthe edge of this ring -is milled as shown at 129, Figs. 2 and l v3, for convenient, manipulation. One side .face of the ring 128is formed with a spiral groove 130 receiving a pin 131 projecting from the block 127, and extending through theprolongation 122 of the tool carriage is a set screw v132 in position to engage that face ofthe yring 128 remote from the groove 130 to holdtlie ring against rotation when desired. By loosening the vscrew 132 the ring 128 may be rotated and the spiral groove 130 will cause the nut vblock 127 to movev into or out of engagement with the screw-end 37 of therod 35, so that-the 7carriage Amay be fed by the rotation lof the screw rod 35, orthis feeding may be stopped Vwhenever desired. Since thetool carriage 117 is made fast to the shaft .27 the feeding of the carriage by the screw yend 37 ofthe rod 35 is participated in bythe shaft 27 which under such circumstances merely moves lengthwise, but does not rotate. This shaft or tube mayl be rocked, however, by

manipulation of the crank 78 to. an extent permitted by the length of the slot 68 1n fthesleeve 66,.,and .this ,rocking movement causes a similar movement of. theftool 'carnage thereby feeding the tool toward -k or from the work, which is assumed to be held between; the centers 53 and 83.

YSince the tail stock is stationary, small work can be held between the centers 53 and 8.3only by moving the rod or tail stock spindle 51 for a considerable distance beyond its support in theV ltail. stock. Under such circumstances the use of a steady-rest is desirable, andv such steady-rest is shown in the drawings as constituting a sleeve 133 carried by a post 134 terminating in a base portion 13.5,best-shown at Fig. 9, adapted to underride the bed 1v and be secured thereto by a set screw 136. In order to lock` the tail stock spindle 31 against lengthwise movement a `set screw 137 is provided on the sleeve 133 in position to engage the spindle 51 and so lock it in place. y y

- In .order tocompact and cheapen the strucvture without vsacrifice `of accuracy or efficiency, all boXings are avoided, and in their place wearf take-up means are provided. Sinceall the wear take-u means are substantially alike, but one of .them will be described in detail, and this with reference to F ig. 8. In transverse relation to the passage 49 there is another passage 138 in which is mounted a block 139 preferably, though not necessarily, of cylindrical form, and this block has transversely therethrough a passage 140 slightly larger in diameter than the passage 49 and suificiently large to permit the screw rod 55 to move freely therethrough. The block 139 is controlled by a set screw 141 which in the particular showing of Fig. 8 has a manipulating head 142 of familiar form, but any other suitable means for adjusting theV block 139 may be employed. These blocks are all comparatively large with respect to the bearings for the various parts they control, so that in the case of wear a slight turnofthe screw 141 tends to take up all such wear, forcingthe turning parts always toward the same side of the bearings, and thus keepingv them constantly in workable alinement. ABesides the block 139 there aresimilar blocks 143, 144, 145, 146 and 147 for the spindle 51, shaft vor tube 27, head stock spindle 80 and shaft 9 0.

Let it be assumed first that it is desired to turn some wood or other similar substance upon Ythe lathe. The stock is'inserted between vvthe spur plate 97 and, thecenter 57, the stock being held sufficiently tight by a suitable manipulation of the screw shaft 55, the block 62 .being either allowed to remain fast tothe tail stock spindle 51 vor loosened therefrom. Now, with the parts in the position shown in .the drawings rapid rotative movement is given vto the stock, and while the head stock spindle .80 may be rotated Y especially if the gear wheel 38 be moved out of mesh with the gear pinion 84, and this is the customary practice. Suppose, however, that it is desired to cut screw threads upon suitable stock, such stock is mounted between the centers 83 and 53, and is connected up to the face plate or gear 81 by the employment of a suitable lathe dog. If it be desired to cut a rather fine thread, or to do common turning at slow speed and high power and also slow feed, then the gear wheel 93 remains as shown in the drawings out of mesh with the gear wheel 85 and the gear pinion 95 remains in mesh with the gear wheel 81, and the gear wheel 38 remains in mesh with the pinion 84, while the carriage 117 is coupled to the screw end 37 of the feed screw rod 35. Under these circumstances the work is rotated with a speed corresponding to the relation of the pinion 95 to the gear wheel 81 and the tool carriage is fed along the work with a speed corresponding to the pitch of the threads of the lead screw rod 35 and the relation of the pinion 84 to the gear wheel 38, the reverse gearing carried by the roclr arm 103 being at this time in the neutral or inactive position. The tool on the tool carriage is moved into engagement with the work by a suitable manipulation of the crank disk 77. If, now, it is desired to use higher speed for light turning or filing, the gear wheel 93 is moved into mesh with the pinion 85, thus disconnecting the pinion 95 from the gear wheel 81, and, the other connections remaining as before, the work is rotated with greater rapidity because of the changed relation of the driving gearing, and the same screw threads are cut, or light common turning done.

lf it be desired to cut right or left hand threads of the same pitch as the lead screw 35, the gear 38 is moved out of mesh with the gear 84 and the arm 104 is manipulated to bring the gear pinion 112 into mesh with the gear 85, or the pinion 116 into mesh with the gear 85, as the case may be, the result being right or left hand threads in accordance with the position of the reverse gearing controlled by the arm 104. To get more power and slower speed, the pinion 95 is brought into mesh with the gear 81, in which case the gear wheel 83 is out of mesh with the gear wheel 85. Still further variations may be had by removing the lead screw rod 35 and substituting one on which the threaded end 37 is of a different pitch, the feed nut lock 127 being also changed.

By the employment of suitable tools and regulating the cut of the tools metal may be readily turned without the necessity of producing screw threads.

In order to prevent longitudinal movement of the sleeve 29 it is provided with a circumferential groove 148 where the sleeve f passes through the bearing 26, and this bearing is traversed by a pin 149 in position to seat in the groove 148, thus permitting the sleeve 29 to rotate, but preventing longitudinal movement thereof. The function of the pin 149 may be performed by a pivoted latch arm 150 shown in Fig. 4al and pivoted to an ear 151 on the leg 25 adjacent to the bearing 26. Such arrangement avoids the necessity of a pin which must be driven through a hole and when it is desired to dismantle the structure, it must be driven out again. lVith the arrangement shown in Fig. 4a the sleeve 29 is readily released for permitting removal by simply lifting the latch arm 150.

Since the bearing 26 is at the free end of the leg 25, such end of the leg 25 may spring under some circumstances, and in order to prevent this contingency there is provided a connecting bar 152 secured by screws 153 at the respective ends to the bearing end 26 of the leg 25 and to the head stock adjacent to the bed 1, the bar 152 preventing any springing movement of the leg 25.

1While the tool carriage 117 performs in general the functions of a slide rest, it is in fact carried by and moves with the tubular shaft or spindle 27, which in turn is capable of longitudinal sliding movement in the head and tail stocks, the latter being in fixed relation one to the other, while the main feed screw or screw rod 35 extends through this tubular spindle 27 and causes the feeding of `the tool carriage lengthwise of the lathe when the feed nut 127 is in engagement with the threaded end 37 of the feed screw. Movements of the tool toward and from the work are due to the rocking movement of thev sliding spindle sustaining the tool carriage, and in the particular arrangement shown in the drawings such rocking movements are determined by adjustments of the worm 71 performed by hand.

In the lathe of the present invention those parts holding the worlr are to one side of the vertical plane of the bed, and no part of the bed directly underrides the work holding members of the lathe. 'Because of this arrangement all chips and shavings fall clear of the bed and besides all the working parts liable to clogging by chips or shavings are thoroughly protected and inclosed and the bed itself has a rounded upper surface to which chips or shavings will not readily cling.

The tool carriage may be hand fed, when desired, by having the reversing gear disengaged, that is, with the drum 104 so placed that the tooth 106 engages in the central notch 107, and the gears 38 and 84 disengaged. By using the gear 38 as a hand wheel and also manipulating the hand wheel 77, the carriage is moved in either direction as fast or slow as desired, and the tool is moved toward or from the work. Writh the hand control i of the tool carriage either speed may be used.

lVhat is claimed is l. A lathe provided with a bed mounted for rocking movements about its longitudinal axis, and a head stock fixed to the bed and participating in the rocking movements thereof.

2. A lathe provided withy a bed mounted for rocking movements about its longitudinal axis, and a head and tail stock both fixed to the bed and participating in the rocking movements thereof.

3. A lathe provided with a bed mounted for rocking movements about its longitudinal axis and having head and tail stocks fixed to said bed.

4; A lathe provided with a bed having head and tail stocks permanently fixed thereto in spaced relation, the `tail stock having an elongated'spindle withl a range of movement with respect to. the'tail stock substantially equal to the effective distance between the head and tail stocks.

5. A lathe provided with a bed having head and tail stocks at and in permanently fixed relation to the respective ends of the bed and also effectively in one piece therewith, said head and tail stocks having alined head and tail spindles, the tail spindle being mounted for longitudinal movement with respect to the tail stock and of a length to have a range of movement substantially equal to theeflective distance between the head and tail'stocls, and means for causing a lengthwisev movement of the tail spindle to any vdesired extent within its range of travel.

6. A lathe provided with a bed having head and tail stocks at and in permenently fixed relation to the respective ends of the bedl and veffectively in one piece therewith, and provided with alined head and tail stock spindles, the tail stock spindle being mounted for longitudinal adjustment and of a length to have a range'of movement substantially that of the distance between the head vand tail 'stocl's,said tail stock` being also vided with clamping means forV connect-ing it to the tail stock spindle at different points along the-length of the latter.

7. A lathe provided with a bed having a head andftail stock and working parts carried thereby, supporting 'legs for the ends of the bed having cap plates adaptedpto the ends of the bed, and a seeuringbolt extending lengthwise through the bed and the cap plates. Y

8. A lathe provided with a bed having a head and tail stock and working parts-car? ried thereby, supporting legs for the ends of the bed having cap plates adapted tothe ends of the bed, and a securing bolt extend-4 ing lengthwise through the bed and the cap plates,'the bed and cap plates being coac-l tively formed to permit rocking movements of the bed in the cap plates and the bolt serving as a clamping means for holding the bed in adjusted positions.

9. A lathe provided with a rcckable bed, head and tail stocks carried thereby with the head stock having a driving pulley and the rocking movements of the bed causing movements of the driving pulley toward and from the source of power from which the driving pulley receives motion.

10. A lathe provided with a bed rockable about its longitudinal axis, supporting means for the bed, a pulley mounted upon the supporting means, head and tail stocks mounted on thebed, and a pulley mounted on the head stock in position to receive power-from the pulley on the supporting means,.and movable by rocking movements of the bed toward and from the first-named pulley. l

ll. Alathe provided with a bed, head'and tail stocks fixed thereto, alined spindles mounted in the head and tail'stocks, a lon-iV gitudinally movable rockable spindle mounted in the head and tail stocksin parallel re lation to the first-named spindles, a tool carriage mounted on the last-named spindle, av feed screw in the last-named spindle, feeding connections between the feed screw and the tool carriage, and gear connections carried by the head stock for turning the head stockspindle and the feed screw.

12. y A lathe provided with a bed, head and tail stocks fixed thereto, alined spindles mounted in .the head and tail stocks, a longitudinally movable rockableV spindle mounted inthe head and tail stocks in parallell relation to the first-named spindles',

tool carriage mounted on the last-named spindle, a feed screw inthe last-named spindie, feeding connections between the feed screwl andthe tool carriage, and gear con-- nections carried by the head stock for turn-V ing the head kstock spindle and the, feed screw, vsaid feed screw having readily re- Y movable connections with the gearing for` the removal of ATthe feed screw and interchange with other feedy screws, at will. Y

13. A lathe provided with head and tail stocks and headand-tail'stock spindles, another spindle mounted in the head and tail stocks and slidable longitudinally therein, a

tool carriage on the last-named spindle and movable therewith, a feed screw extending into' the last-named spindle for impartingl longitudinal movement thereto, gearing con. i

nections betweenvthehead stock spindle andV the feed screw, a driving shaft on the'head stock, and speed changing gearing between the driving shaft and the head stock spindle.

1-1. A lathe provided with head and tail stocks and head and tail stock spindles, another spindle mounted in the head and tail stocks and slidable longitudinally therein, a tool carriage on the last-named spindle and movable therewith, a feed screw extending into the last-named spindle for imparting longitudinal movement thereto, gearing connections between the head stock spindle and the feed screw, a driving shaft on the head stock, and speed changing gearing between the driving shaft and the head stock spindle, said speed changing gearing comprising gears of dierent diameters mounted on the head stock spindle, and other gears of correspondingly different diameters mounted on the shaft carried by the head stock, said shaft being mounted for longitudinal adjustment, and the gears being so spaced as to cause the intermeshing of certain mating gears and the simultaneous throwing out of mesh of other mating gears.

15. 1n a lathe, a head stock provided with a spindle having a face plate with peripheral gear teeth, and other gears of different diameters on said spindle, a longitudinally movable shaft mounted on the head stock and provided with mating gears for the face plate gear and one of the other gears on the spindle, the spacing of the gears on the shaft being different from that on the spindle, a longitudinally movable spindle mounted in the head stock and provided with a tool carriage thereon, a gear sleeve mounted on the head stock in line with the last-named spindle, a gear wheel mounted on the gear sleeve and movable longitudinally thereof into and out of mesh with one of the gears of the head stock spindle, and a feed screw carried by the longitudinally movable spindle and having means for securing it to the gear sleeve for rotation therewith.

16. 1n a lathe, a head stock provided with a spindle having a face plate with peripheral gear teeth, and other gears of dierent diameters on said spindle, a longitudinally movable shaft mounted in the head stock and provided with mating gears for the face plate gear and oneof the other gears on the spindle, the spacing of the gears on the shaft being different from that on the spindle, a longitudinally movable spindle mounted in the head stock and provided with a tool carriage thereon, a gear sleeve mounted on the head stock in line with the last-named spindle, a gear wheel mounted on the gear sleeve and movable longitudinally thereof into and out of mesh with one of the gears of the head stock spindle, and a feed screw carried by the longitudinally movable spindle and having means for securing it to the gear sleeve for rotation therewith, the head stock being also provided with directionchanging gearing movable into and out of engagement with one of the gears of the head stock spindle and with the gear sleeve.

17. A lathe having a bed, head and tail stocks thereon, head and tail spindles carried by the respective stocks, and other head and tail spindles carried by the respective stocks and more distant from the bed than the first-named spindles, the second-named head spindle having means for driving the first-named head-spindle and both tail spindles being independently adjustable in the tail stock, and the second named tail spindle having connections wtih the first-named tail spindle for the longitudinal adjustment of the first-named tail spindle by the secondnamed tail spindle.

18. A lathe having a bed, head and tail stocks thereon, head and tail spindles carried by the respective stocks, and other head and tail spindles carried by the respective stocks and more distant from the bed than the first-named spindles, the second-named head spindle having means for driving the first-named head spindle and both tail spindles being independently adjustable in the tail stock, and the second named tail spindle having connections with the first-named tail spindle for the longitudinal adjust-ment of the first-named tail spindle by the secondnamed tail spindle, said connections between the two tail spindles being on the side of the tail stock remote from the head stock and in readily removable relation to the first-named tail spindle.

19. A lathe having head and tail stocks and alined head and tail spindles, another head spindle longitudinally movable in the head stock, and another tail spindle alined with the second-named head spindle, said head spindles having variable gear connections between them differently spaced apart on the two spindles for causing the meshing of the gear connections in different speed relations by the longitudinal movement of the second-named head spindle.

20. A lathe having head and tail stocks and alined head and tail spindles, with the tail spindle adjustable toward and from the head spindle, another head spindle longitudinally movable in the head stock, another tail spindle alined with the second-named head spindle, variable gear connections between the second-named head spindle and the first-named head spindle for driving the latter, another spindle common to both the head and tail stocks and movable longitudinally therealong in parallel relation with the first-named spindles, a tool carriage mounted on said third-named spindle, a feed screw extending into the third-named spindle, gearing connections between the firstnamed head spindle and the third-named spindle, and feeding connections between the tool carriage and the feed screw.

21. A lathe having head andl tail stocks and alined head and tail spindles, another head spindle longitudinally movable in the head stock, another tail spindle alined with ythe second-named head spindle, variable gear connections between the second-named head spindle and the first-named head spindle for driving the latter, another spindle common to both the head and tail stocks and movable longitudinally therealong in parallel relation with the first-named spindles, a tool carriage mounted in the thirdnamed spindle, a feed screwk extending into the third-named spindle, gearing eonneetions between the first-named spindle and the third-named spindle, feeding connections between the tool carriage and the feed screw, and means for rocking the thirdnamed spindle about its longitudinal axis.

22. In a lathe, a longitudinally movable and axially rockable spindle, a tool carriage mounted thereon, and means for rocking the spindle comprising a sleeve keyed to the spindle and through which the latter is movable longitudinally, said sleeve having a gear segment thereon, and a feeding means for the gear segment carried by a relatively fixed part of the lathe.

23. A lathe provided with head and tail stocks, a longitudinally movable and axially rockable spindle mounted in the head and tail stocks, a tool carriage on said spindle and movable therewith, means for imparting longitudinal movement to the spindle, and means for causing rocking movements of the spindle comprising a sleeve carried by the tail stock and keyed to thespindle, said sleeve having a gear segment thereon, and a worm mounted in the tail stock for engagement with the gear segment.

I 24. In a lathe, av longitudinally movable spindle mounted for rocking movements;

about its longitudinal axis, a feed screw extending thereinto, andY a tool' carriage mounted onthe spindle, said toolvearri-age being provided with a feedl nutf movable into and out of,` engagement vwith the feed 25,. In a lathe, a longitudinally movable spindle, a feed screw extending thereinto, and a tool carriage mounted on the spindle, said tool carriage being providedwith a feed nut movable yinto and out of engagement with the feed screw, said carriage having means for causing the movement of the` nut comprising a rotatable ring surrounding the spindle and having a spiral groove feed nut movable into and out of engagement with the feedy screw, said carriage havingmeans for causing the movement of the nut comprising a rotatable ring surrounding the spindle and having a spiral groove therein, and the nut being provided with a pin entering they groove, said tool` carriage being alsol provided with a clamping means for the rotatable ring.

In testimony, that I claim the foregoing as my own, I have hereto ailixed my signature in the presence of two witnesses.

BURTON H. CLEMENT. 4llVitnesses: i

W. H. ARNoLD, y M. V. HOWARD.

C'opies of this patent may be obtained for ve cents each,` by addressing they Commissioner of PatentVA Washington, D. C. 

